Kenneth Turan, Los Angeles Times Movie Critic, wrote:

For "Inception" is not only about the dream state, it often plays on screen in a dreamlike way, which means that it has the gift of being easier to follow than to explain. Specifics of the plot can be difficult to pin down, especially at first, and guessing moment to moment what will be happening next, or even if the characters are in a dream or in reality, is not always possible. But even while literal understanding can remain tantilizingly out of reach, you always intuitively understand what is going on and why. ( end quote)

Easy to follow but can not be explained? Can't nail down the plot? Literal understanding not easy but intuitive understanding is? Mr. Turan seems to be paraphrasing a line in the movie, " Whose dream are we in?" We are all cool, we get it but we can't understand it!